Jeferson,
Welcome to the fun of painting figures! I know many figure modelers argue that Model Master paints--especially the Acryl line--are not good for figures, but that's what I use! Actually, I use a combination of their Enamels and Acryls for different colors, certain details and various layers or weathering.
As far as the process, I have had great success using Shepherd Paine's technique as described in his How To Build Dioramas book. Basically, paint the skin/face base color first; do the shadows, highlights and 5 o'clock shadow. Then paint the uniform/clothing base color, followed by shadows and highlights. Once that's all done, add the final details.
I use MM Enamels for the skin colors: Flat Dark Tan for the base color, let dry. Paint in the shadows using Flat Dark Tan mixed with a drop of flat black. Lay in the first layer of highlights with Flat Tan; blend this layer in immediately. Paint the highlights using Flat Light Tan and blend. For 5 o'clock shadow, I use Flat Light Tan and Flat Black (or sometimes Flat Rubber), then lightly brush it and blend it on the face.
For 1/35, I use a fine detail brush to lay in the shadows and highlights and use a separate wide, soft brush to blend.
After the figure is painted, I spray it with Testor's Dullcoat in the spray can to seal the work.
Like I said, this is just a technique--my technique--but find what works for you and go with it! Hope this helps and keep us posted on your progress!